1. Medical University of Silesia, Silesian Center for Heart Diseases, Zabrze, Poland
2. Medical University of Gdansk, Gdansk, Poland
3. National Institute of Public Health - National Institute of Hygiene, Warsaw, Poland
4. JASPERS, Warsaw, Poland
5. National Health Fund, Warsaw, Poland
6. Institute of Cardiology, Warsaw, Poland
7. Medical University of Warsaw, Warsaw, Poland